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Large language models (LLMs) often hallucinate in long-form generation. Existing approaches mainly improve factuality through post-hoc revision or reinforcement learning (RL) with correctness-based rewards, but they do not teach the model…

Computation and Language · Computer Science 2026-04-15 Xin Liu , Lu Wang

Reasoning Large Language Models (R-LLMs) have significantly advanced complex reasoning tasks but often struggle with factuality, generating substantially more hallucinations than their non-reasoning counterparts on long-form factuality…

Computation and Language · Computer Science 2025-08-08 Xilun Chen , Ilia Kulikov , Vincent-Pierre Berges , Barlas Oğuz , Rulin Shao , Gargi Ghosh , Jason Weston , Wen-tau Yih

Hallucination, the generation of factually incorrect information, remains a significant challenge for large language models (LLMs), especially in open-domain long-form generation. Existing approaches for detecting hallucination in long-form…

Hallucination remains a major challenge for the safe and trustworthy deployment of large language models (LLMs) in factual content generation. Prior work has explored confidence estimation as an effective approach to hallucination…

Computation and Language · Computer Science 2026-05-15 Caiqi Zhang , Xiaochen Zhu , Chengzu Li , Nigel Collier , Andreas Vlachos

Large Language Models (LLMs) have demonstrated remarkable proficiency in generating fluent text. However, they often encounter the challenge of generating inaccurate or hallucinated content. This issue is common in both non-retrieval-based…

Computation and Language · Computer Science 2024-02-27 Haoqiang Kang , Juntong Ni , Huaxiu Yao

Evaluating the factuality of long-form output generated by large language models (LLMs) remains challenging, particularly when responses are open-ended and contain many fine-grained factual statements. Existing evaluation methods primarily…

Computation and Language · Computer Science 2026-04-06 Nazanin Jafari , James Allan , Mohit Iyyer

Retrieval-augmented generation (RAG) appears as a promising method to alleviate the "hallucination" problem in large language models (LLMs), since it can incorporate external traceable resources for response generation. The essence of RAG…

Computation and Language · Computer Science 2024-10-16 Haosheng Qian , Yixing Fan , Ruqing Zhang , Jiafeng Guo

Retrieval-Augmented Generation (RAG) has emerged as a powerful framework to improve factuality in large language models (LLMs) by grounding their outputs in retrieved documents. However, ensuring perfect retrieval of relevant information…

Computation and Language · Computer Science 2025-12-04 Zhan Peng Lee , Andre Lin , Calvin Tan

Large language models (LLMs) have shown remarkable capabilities in various natural language processing tasks, yet they often struggle with maintaining factual accuracy, particularly in knowledge-intensive domains like healthcare. This study…

Computation and Language · Computer Science 2024-11-01 Hieu Tran , Junda Wang , Yujan Ting , Weijing Huang , Terrence Chen

Large Language Models (LLMs) enhanced with retrieval, an approach known as Retrieval-Augmented Generation (RAG), have achieved strong performance in open-domain question answering. However, RAG remains prone to hallucinations: factually…

Retrieval-Augmented Generation (RAG) enables large language models (LLMs) to access broader knowledge sources, yet factual inconsistencies persist due to noise in retrieved documents-even with advanced retrieval methods. We demonstrate that…

Computation and Language · Computer Science 2025-06-04 Yongjian Li , HaoCheng Chu , Yukun Yan , Zhenghao Liu , Shi Yu , Zheni Zeng , Ruobing Wang , Sen Song , Zhiyuan Liu , Maosong Sun

Large Language Models (LLMs) often struggle to align their responses with objective facts, resulting in the issue of factual hallucinations, which can be difficult to detect and mislead users without relevant knowledge. Although…

Computation and Language · Computer Science 2025-10-14 Siyuan Zhang , Yichi Zhang , Yinpeng Dong , Hang Su

Generation of plausible yet incorrect factual information, termed hallucination, is an unsolved issue in large language models. We study the ability of language models to deliberate on the responses they give in order to correct their…

Computation and Language · Computer Science 2023-09-26 Shehzaad Dhuliawala , Mojtaba Komeili , Jing Xu , Roberta Raileanu , Xian Li , Asli Celikyilmaz , Jason Weston

While Large Language Models have transformed how we interact with AI systems, they suffer from a critical flaw: they confidently generate false information that sounds entirely plausible. This hallucination problem has become a major…

Artificial Intelligence · Computer Science 2025-10-28 Piyushkumar Patel

The recent emergence of Medical Large Vision Language Models (Med-LVLMs) has enhanced medical diagnosis. However, current Med-LVLMs frequently encounter factual issues, often generating responses that do not align with established medical…

Machine Learning · Computer Science 2024-10-18 Peng Xia , Kangyu Zhu , Haoran Li , Hongtu Zhu , Yun Li , Gang Li , Linjun Zhang , Huaxiu Yao

We present a novel framework addressing a critical vulnerability in Large Language Models (LLMs): the prevalence of factual inaccuracies within intermediate reasoning steps despite correct final answers. This phenomenon poses substantial…

Computation and Language · Computer Science 2025-08-05 Rui Jiao , Yue Zhang , Jinku Li

Retrieval-Augmented Generation (RAG) has been proposed to mitigate hallucinations in large language models (LLMs), where generated outputs may be factually incorrect. However, existing RAG approaches predominantly rely on vector similarity…

Information Retrieval · Computer Science 2026-04-28 Miao Xie , Xiao Zhang , Yi Li , Chunli Lv

Retrieval-Augmented Generation (RAG) has emerged as a crucial approach for enhancing the responses of large language models (LLMs) with external knowledge sources. Despite the impressive performance in complex question-answering tasks, RAG…

Information Retrieval · Computer Science 2025-10-14 Haosheng Qian , Yixing Fan , Jiafeng Guo , Ruqing Zhang , Qi Chen , Dawei Yin , Xueqi Cheng

Modern large language models (LLMs) are powerful generators driven by statistical next-token prediction. While effective at producing fluent text, this design biases models toward high-probability continuations rather than exhaustive and…

Machine Learning · Computer Science 2026-02-09 Zhaoyang Chen , Cody Fleming

Large language models (LLMs) often generate content that contains factual errors when responding to fact-seeking prompts on open-ended topics. To benchmark a model's long-form factuality in open domains, we first use GPT-4 to generate…

Computation and Language · Computer Science 2024-11-08 Jerry Wei , Chengrun Yang , Xinying Song , Yifeng Lu , Nathan Hu , Jie Huang , Dustin Tran , Daiyi Peng , Ruibo Liu , Da Huang , Cosmo Du , Quoc V. Le
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